Lock



Sept8,1942. c. J. MQCQRMICK 2,295,4174

4 Loox 4Filed Oct. 11, 1941 LLI 2 sheets-sheet 1 Am n lf. A 'l V ullr Il lll Patented Sept. 8, 1942 Unire einek 6 Claims.

This invention relates to a lock and has for an object to provide a lock which will be very difficult and complicated to pick or manipulate without its own combination-al or primary key.

A further object is to provide a lock having a `primary key and a secondary key, the former being carried on a persons key ring and the latter -being attached permanently to the lock, insertion of the former permitting of the latter being manipulated to withdraw the lock bolt.

A further object is to provide a primary key having a hinged section normally tting in a .groove in the handle section and adapted to be rocked out of the groove .and inserted in the lock in such manner that the hinged section will be deflected across the path of the secondary key and through the secondary key to intert with the combination element and be positioned thereby to engage back ci a spring pressed tooth on a slide which is connected to the bolt so that the secondary key may be pushed in to swing the hinged section of the key, while the handle section is held stationary for withdrawing the bolt.

A further object is to provide apparatus of this character which will be formed of a few strong, simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order. i

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacriiicing any of the advantages of the invention.

In the accompanying drawings vforming a part of this specification:

Figure 1 is a horizontal section of a lock ccnstructed in accordance with the invention.

Figure 2 is a horizontal section similar to Figure 1 but showing the parts in position to hold the bolt withdrawn.

Figure 2a is a view similar to Figure 1, with parts in elevation, and showing the normal position of the parts before the primary key is inserted.

Figure 3 is a cross sectional View taken on the line 3 3 of Figure l.

Figure 4 is a front elevation of the lock showing the opening t receive the primary key and showing the outer end of the secondary key.

Figure 5 is a cross sectional View taken on the line v5 5 of Figure 1.

Figure 6 is a cross sectional View taken on the line @-55 of Figure l.

Figure 7 is a cross sectional View taken on the line 'l-l of Figure 1. v

Figure 8 is a detail perspective view of the combination element into which the hinged section ci the primary key must intert before the primary key can arrive in operative position back of the tooth of the bolt slide.

Figure 9 a detail perspective view of the secondary key showing the opening therein to receive the hinged section of the primary key whereby the secondary key may be pushed in to withdraw the bolt.

Figure 10 is a detail perspective View of the primary key with the hinged section extended.

Figure ll is a detail perspective view of the bolt, slide, and spring pressed tooth.

Figure i2 is a detail perspective view of a latch which must be dislodged by the primary key.-

`Reierring now to the drawings in which like characters of reference designate 'similar parts in the various views, the lock casing comprises a two piece section iii having a. section Il extending at a right angle thereto the former being adapted to be secured to the inner face of the door l2 and the latter extending through an opening i3 in the door to the exterior of the door and being equipped with a tubular member Ill, see Figure l, which is formed integral with a circular plate l5 adapted to be secured to the outer face of the door by bolts i6. The face plate is provided with a substantially square opening I1 which receives the secondary key i8 and also having an oblong opening I9 which receives the primary key 29, see Figures 9 and l0. Shims 2| are disposed in the tubular member I4 to accommodate the lock casing to doo-rs of different thickness.

The primary key comprises a handle section 22 having a longitudinal groove 23 therein to receive the hinged section 2'4 of the key, the hinged section being secured at one end to a pivot pin 25 disposed at the outer end of the groove. The handle section is provided with` a key ring receiving opening 25 and is also provided in the sides with oppcsitely disposed notches 21 the purpose of which will presently be explained. rIhe hinged section 24 is provided with oppositely disposed kerfs 2S which are reciprocal to a series of concentric arcuate plates Z, see Figure 8, which form the combination element of the lock and which are provided with a hook 3? adapted to pass into an opening 3l in the key hinged section before the hinged section of the key can assume such position as to be instrumental in operating the lock.

The bolt of the lock is best shown in Figure 11 and comprises a tongue 32 which enters the keeper 33 in the door frame 34, see Figure 1, the tongue being attached by an arm 35 to a bar 36 having a right angularly disposed finger 31 at its outer end for cooperation with a night latch 38 hereinafter described. A slide 39 is pivotally secured to an arm 40 which is hinged as shown at 4| in an opening 42 formed in the bar 36. The slide is provided with a tooth 43 which is pivoted to the slide as shown at 44 and is normally held to extend at a right angle to the slide by a helical spring 45. The tooth is provided with a cam face 46 the purpose of which will presently appear. The bar 36 is provided with an extension 41 of the opening 42 and there is a notch 48 in one wall of the extension to receive a lever for manually operating the bolt from the inside of the door. The bolt, completely assembled, is mounted in a suitable cavity in the part I of the lock casing, see Figure 1.

A cam 49 is secured in the lock casing part I0 and is provided with a cam face 56 adapted to deflect the hinged section 24 of the primary key through an opening in the secondary key I8 before the primary key can cooperate with the combination element 29 and be moved by the secondary key to withdraw the latch. The opening 5| of the secondary key is formed in the inner section 52 of the key, the outer section 53 of the key being telescopically assembled with the inner section to adjust the key to doors of various thicknesses so that a square head 54 on the outer section of the secondary key will normally lie within the recess |1, see Figure 2a, until the secondary key is pushed out suiciently by the primary key to be grasped` by the operators ngers, this position being shown in Figure 1.

Disposed in the section of the lock casing is a spring pressed tilting latch 55 which is normally in the position shown in Figure 2a and engages the Wall of an opening 56 in the secondary key. When the primary key is thrust into the opening I9 it first encounters the latch 55 and tilts it to shove the secondary key outwardly from the position shown in Figure 2a to the position shown in Figure 1. Continued movement of the primary key causes the hinged section 24 to encounter the inclined cam face 50 and be deflected through the opening 5| in the secondary key. Thereupon a latch 51, see Figure 12, controlled by a spring 58, engages two projections 59 thereon in the aforesaid notches 21 of the handle section of the key to hold the handle section stationary and properly position the pivot pin of the hinged section at the center of curvature of the plates of the combination element 29. At this time the operator may grasp the head 54 of the secondary key and pull the secondary key outwardly to swing the pivoted section of the primary key through the combination element until it lodges underneath the tooth 43 and the hook is received in the opening 3| of the hinged section 24. The operator may now push the secondary key inward whereupon a Wall of the opening 5| in the secondary key swings the hinged section 24 of the primary key back through the combination element 29, see Figure 2, in which movement the hinged section, through the medium of the tongue 43, retracts the bolt from the keeper. The knob of the door may now be grasped to open the door while the secondary key remains in the pushed in position shown in Figure 2.

When advancing the primary key 28 through the combination element 29 by pulling outwardly the secondary key I6, as heretofore described, the hinged section 24 will engage the cam surface 46 of the tooth 43 and rock the tooth on its pivot to permit the hinged section to pass back of the tooth at which time the tooth will spring back to its initial position and strike the Wall of the opening 60 in which it is pivoted thereby producing an audible click which will warn the operator that the primary key is in operative p0- sition and may be actuated by pushing in the secondary key to withdraw the latch bolt.

The arm 36 of the latch bolt is provided with a hook 5|, see Figure 11, to which one end of a helical spring 62 is attached, the other end of the spring being anchored to a pin 63 in the lock casing, see Figures 1 and 2. The spring returns the bolt to latched position in the keeper .33 after each unlocking of the lock.

The linger 31 of the bolt projects exteriorly of the lock casing and may be grasped from inside the door to manually withdraw the bolt. The heretofore mentioned night latch 38 is in the nature of a plate slidably mounted on the lock casing having guide flanges 64, see Figure 5, engaged in guide grooves in the lock casing. The night latch is provided with a finger 65 which may be grasped by the operator to slide the night latch to overlapping engagement with the linger 31 of the bolt, see Figure 2a, to prevent the bolt from being withdrawn.

A pin 66 having a knob 61 underlies a centrally pivoted lever 68, see Figure 3, which is spring pressed at one end by a helical spring 69 to engage in the aforesaid notch 48 in the bolt when the bolt is in unlatched position. By pressing in the pin 66 the lever is dislodged from the notch whereupon the bolt is released to go back into latched position.

The lock casing securing bolts I6 are engaged through apertured lugs 10 on the lock casing l0, see Figure 3, to draw both sections of the lock casing into rm engagement with the door. The two parts of each casing section I0 and are secured together by screws 1|.

Since the operation of the parts has been described as the description of the parts progressed it is thought the invention will be fully understood without further explanation.

What is claimed is:

1. A lock comprising, a casing, a secondary key permanently assembled with the casing, a primary key adapted to be inserted in the casing having a hinged section provided with combination grooves adapted to be engaged through the secondary key, a combination element in the casing having curved plates reciprocal to said grooves when the hinge of the pivoted section is at the center of curvature of the plates and permitting the secondary key to be pulled outwardly to swing the hinged section upon the plates, means dislodgeable by the primary key upon entering the casing for moving the secondary key outwardly into position to be manually grasped to swing the pivoted section, a bolt in the casing, a slide in the casing connected to the bolt, a spring pressed tooth on the slide overlapping the hinged section when the hinged section element, means for locking the primary key stationary to permit the secondary key swinging the hinged section, means for normally holding the bolt in locked position, means for manually withdrawing the bolt from the inside of the door, means for releasably holding the bolt against manual withdrawal, and a night latch on the casing preventing withdrawal of the bolt by said hinged section.

2. The structure as of claim 1 and in addition thereto a cam in the casing for deilecting the pivoted section of the primary key toward the combination element when the primary key is being pushed into the casing.

3. The structure as of claim 1 and in which the means dislodgeable by the primary key comprises a spring pressed tilting latch normally engaging a wall of an opening in the secondary key to shove the secondary key outwardly a short distance from the casing when the primary key is thrust into the casing.

4. The structure as of Claim l and in which the spring pressed tooth is mounted in an opening in the slide and is provided with a cam face over which the hinged section rides to depress the tooth and pass behind the tooth with subsequent return of the tooth to project at a right angle from the slide in front of the hinged section and impinge against a wall of said opening to produce an audible click to give warning that the hinged section is in operative position to be moved by the secondary key to withdraw the bolt.

5. The structure as of claim l and in which the means for locking the primary key stationary comprises a spring controlled latch adapted to engagein notches in the primary key to hold the primary key stationary and properly position the hinge of the hinged section at the center of curvature of the plates of the combination element.

6. The structure as of claim 1 and in which the night latch comprises a plate having guide anges slidably engaged in grooves in the casing adapted to be slid to obstructing position on the exposed rear end of the bolt.

CLARENCE J. MCCORMICK. 

